Fix: RPL set editor 'saved with model' state icon visibility [5781]
Bug Number: 5781
Release notes (y/n): Yes
For Release Nums: 7.1.6 and 7.2

When the "Save Loaded RPL Set with Model" checkbox is checked (in the 
Rulebased Simulation run Parameters configuration dialog box), the RBS 
Ruleset Editor dialog for the LOADED set shows a small RiverWare-model 
themed icon indicating that THAT Ruleset will be saved with the model.

See this screenshot:
  http://cadswes2.colorado.edu/~philw/2017/bugs/5781/Illustration.png

The visibility of that icon was not always correct.  There were two problems:

  (1) The method to update the visibility of that icon did not take 
      into account whether the dialog box's Ruleset was the single 
      LOADED Ruleset, and 

  (2) That method was not being called when the dialog was first shown, 
      resulting in the icon being unconditionally shown.

See the change in method, RplSetDlg::updateSaveWithModelStatus(), 
and the added call to that method from the RplSetDlg constructor.

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